INVESTMENT SECURITIES - Narrative (Details)	3 Months Ended
	Mar. 31, 2022 position
Financing Receivable, Credit Quality Indicator [Line Items]
Maximum individual state general bond obligation as a percentage of total debt securities (percent)	1.00%
Securities in unrealized loss positions, number of positions	1,215
Securities, number of positions	1,760
S&P AA- rating
Financing Receivable, Credit Quality Indicator [Line Items]
Percentage of debt securities considered to be of investment-grade (percent)	96.00%